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101 display basics
How does voltage drop affect the data line?
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[QUOTE="AAH, post: 98417, member: 543"] A standard pixel inserted into the line will regenerate the signal and go an extra x metres. The difference between a pixel and a buffer is the ability to drive a square wave signal into a capacitive cable. Referring back the that square wave picture what you are seeing is the effect of an RC (resistor capacitor) curve. The capacitance is from the length of cable and increases the longer the cable is. The resistance comes from 2 sources. It comes from the very low resistance of the cable (it has to be low to allow amps of current to power pixels) and the internal resistance of the IC that is driving the cable. Pixel chips have a fairly high source resistance / low drive current which is 1 of the major limiting factors in how far they can be separated. The chips that I chose for the buffer were specifically chosen because they have a high drive current. This means that the shape of the square wave data signal remains squarer for longer. Other sneaky stuff in the design is there to reduce the ringing as seen as in d) and e) of the picture. [/QUOTE]
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How does voltage drop affect the data line?
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